Elasticity-controllable trampoline using plate spring

ABSTRACT

Disclosed is an elasticity-controllable trampoline using a plate spring that can be manufactured in small size and in low height compared with existing trampolines using coil springs, thereby proving stability to a user. Also, it has a mechanical structure, thereby providing a semi-permanent life term. Under the principles of a lever using the third law of motion, particularly, the plate spring carries out action in smooth manner, in operation and also carries out reaction with the jumping operation of the user, such that the trampoline of the present invention will have a strong elasticity. In addition, a plate spring support movable stand on the plate spring is moved in simple manner according to the principles of the lever, thereby allowing the elasticity of the plate spring to be controlled. With the adjustment of the upward and downward motion of an action point operation bolt, the height of the upward and downward motion can be adjusted. Specifically, the step plate is maintained at a horizontal state, upon upward and downward motion, by the adoption of a coupling movable member for maintaining the step plate horizontally, and a bearing sheet is formed on the step plate with a result that the step plate can carry out a twist motion.

TECHNICAL FIELD

The present invention relates to an elasticity-controllable trampolineusing a plate spring.

BACKGROUND ART

A conventionally developed trampoline operates in such a manner that aplurality of coil springs are coupled to an iron frame, so that itoccupies a relatively large area. Moreover, the trampoline can controlthe elasticity thereof only with the attachment and detachment of thecoil springs. The trampoline is formed by fabrics, thereby making itdifficult for a user to maintain a horizontal level, and it is alsodifficult to install a handle grip thereon in terms of thecharacteristics of the trampoline, thereby not providing any stabilityto the user. In addition, serious noises are caused at the time offriction between the plurality of coil springs. Because of theseproblems, there is a need for a novel small-sized trampoline capable ofproviding stability and convenience to the user.

DISCLOSURE OF INVENTION

It is an object of the present invention to provide anelasticity-controllable trampoline, using a plate spring adopting leverprinciples, in which upon action it operates by the lever principles andupon reaction it exerts an elastic force at a time, under the law ofaction and reaction as third law of motion, whereby the trampolineproduces a strong elastic force at an expense of small force, has arelatively low height relative to an operation distance, provides a stepplate that is level with the surface of land, thereby permitting thestability of use, occupies a relatively small area, controls theavailable elasticity if necessary, adjusts the motion height (theoperation distance) if necessary and does not produce any noise, suchthat it can be effective as indoor sporting goods, manufactured at a lowproduction cost and semi-permanently used for a long period of time.

To accomplish the above objects of the present invention, there isprovided an elasticity-controllable trampoline using a plate spring,which includes: a fixed plate and a step plate coupled by means of aknuckle pin on the both sides of a step plate coupling movable memberand a coupling movable member for maintaining the step platehorizontally; the plate spring operated by means of an action pointoperation bolt; and a plate spring support movable stand moved by therotation of a horizontal moving shaft with a thread for moving the platespring support movable stand, whereby the elasticity of the plate springcan be controlled and upward and downward motion distance can becontrolled under a length control by means of the action point operationbolt.

BRIEF DESCRIPTION OF THE DRAWINGS

Further objects and advantages of the invention can be more fullyunderstood from the following detailed description taken in conjunctionwith the accompanying drawings, in which:

FIG. 1 is a perspective view of an elasticity-controllable trampolineusing a plate spring according to an embodiment of the presentinvention;

FIG. 2 is a sectional view of the elasticity-controllable trampoline ofthe present invention; and

FIGS. 3 to 5 are sectional views of the elasticity-controllabletrampoline according to another embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

According to the present invention, as shown in FIGS. 1 and 2 anelasticity-controllable trampoline using a plate spring is constructedin such a manner that a step plate 14 is coupled on the upper end of afixed plate 5 with a step plate coupling movable member 16 and acoupling movable member 15 for maintaining the step plate 14horizontally via a knuckle pin 4, with a result that the step plate 14can be operated upward and downward. Thus, the step plate 14 operates atthe expense of small force by virtue of an action point operation bolt17 under the principles of a lever. Moreover, the plate spring 11 adoptsthe principles of the lever in accordance with the movement of a platespring support movable stand 7. As a result, the principles of the leverare embodied twice in the elasticity-controllable trampoline accordingto the present invention. Thereby, the trampoline of the presentinvention operates under the third law of motion.

The plate spring 11 is secured at the one side thereof by virtue of aholder 9 for a horizontally moving shaft 8 and operates upward anddownward, based upon the operation force of the action point operationbolt 17. And, the plate spring support movable stand 7 moves on thethread of the horizontally moving shaft 8, thereby providing an effectof moving the support point of the lever. Therefore, a degree of actionof force is varied in proportional to the operation distance, such thatthe elastic force the plate spring 11 has can be controlled. The upwardand downward motion distance is adjusted by the rotation of the actionpoint operation bolt 17, such that the upward and downward motiondistance of the step plate 14 can be controlled. In order to eliminatefriction around the pin of the action point operation bolt 17, a ballbearing is inserted into the action point operation bolt 17. Thecoupling movable member 15 for maintaining the step plate 14horizontally can operate in horizontal relation with the step plate 14by virtue of the movable member and the knuckle pin 4 on the step plate14 and the fixed plate 5.

Under the aforementioned construction, an explanation of the operationand effect of the trampoline of the present invention will be belowdiscussed. A rotary handle grip 10, which is coupled to the horizontalmoving shaft 8 with the thread for moving the stand 7, rotates left andright, with a result that the plate spring support movable stand 7 ispositioned at a predetermined location, thereby permitting the elasticforce available to be determined. As the action point operation bolt 17rotates left and right, it is adjusted in length, so that the height ofthe motion is controlled. Under the above state, if a user gets andstamps on the step plate 14, the force is applied to the step platecoupling movable member 16 coupled to the step plate 14, with aconsequence that the action point operation bolt 17 makes the platespring 11 descended. When the operation elasticity reaches a limit, thestep plate 14 is ascended by the action of a strong restoring force ofthe plate spring 11, with a result that the user can be elasticallyjumped. At this time, the principles of the lever adopted repeatedly bythe location of the plate spring support movable stand 7 and theoperation position of the action point operation bolt 17 are employedwith the elasticity of the plate spring 11 in mixed relation to eachother, so that a substantially strong elastic force from the platespring 11 can be exhibited at the expense of small force. Also, therotation of the step plate 14 is made by virtue of a bearing sheet thatis disposed on a step plate fixing member 12.

Referring to FIG. 3 showing the elasticity-controllable trampoline usingthe plate spring according to another embodiment of the presentinvention, only the step plate coupling movable member 16 is coupled onthe fixed plate 5 by means of the knuckle pin 4, and the step platecoupling movable member 16 is integrally coupled with the step plate 14on the other side thereof.

Referring to FIGS. 4 and 5 showing the elasticity-controllabletrampoline using the plate spring according to yet another embodimentsof the present invention, a roller 20 is coupled on a plane plate 19,and the action point operation bolt 17, which is integrally formed withthe step plate coupling movable member 16, operates on the plane plate19 such that the elastic force of the plate spring 11 and the operationof the step plate 14 become smooth.

INDUSTRIAL APPLICABILITY

As set forth in the foregoing, an elasticity-controllable trampolineusing a plate spring according to the preferred embodiments of thepresent invention operates by double adoption of the principles of alever and utilizes the elastic force of the plate spring, whereby itexhibits an excellent elasticity, thereby providing a strong jumpingforce to a user at the time of operation. In addition, the trampoline ofthe present invention can control the elasticity thereof and the widthof upward and downward motion. Moreover, it can maintain a step plate ata horizontal state upon upward and downward motion, and the height ofthe step plate is substantially low when compared with the operationdistance, thereby providing stability to the user. Also, it ismanufactured in small size such that it is easy to move, and it is alsomanufactured at a low production cost such that it has competition inprice. Based upon the above, it can be appreciated that the trampolineof the present invention will be the indoor sporting goods having anexcellent effect.

1. An elasticity-controllable trampoline using a plate spring,comprising: a fixed plate and a step plate coupled by means of a knucklepin on both sides of a step plate coupling movable member and a couplingmovable member for maintaining said step plate horizontally; said platespring operated by means of an action point operation bolt; and a platespring support movable stand moved by the rotation of a horizontalmoving shaft with a thread for moving said plate spring support movablestand, whereby the elasticity of said plate spring can be controlled andupward and downward motion distance can be controlled under a lengthcontrol by means of said action point operation bolt.
 2. The trampolineas defined in claim 1, wherein only said step plate coupling movablemember is coupled on said fixed plate by means of said knuckle pin, andsaid step plate coupling movable member is integrally coupled with saidstep plate on the other side thereof.
 3. The trampoline as defined inclaims 1 to 2, wherein said action point operation bolt, which isintegrally formed with said step plate coupling movable member, operateson a plane plate to which a roller is coupled, such that the elasticforce of said plate spring and the operation of said step plate becomesmooth.